Skiving machine



A ug. 5. 1924 Filed Aug. 24 1923 Patented Aug. 5, 1924.

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FRANK W. CHRISTY, OF BEVERLY, B'IA SSAGHTJ'SETTS, ASSIGNOIB, TO UNITED SHOE MA- GHINERY CORPORATION, OF PATERSON, NEW JERSEY, CORPORATION OF 1\TEW SKIVING MACHINE. I v .I

Application filed August" 24, 1923. Serial No. 659,173.

upper leather for use in the manufacture of boots and shoes. i i

' In the process of manufacturing boots and shoes it is customary to skive the edges of Vamps, tips and other shoe parts and in order to meet various conditions it is necessary that means be provided for producing scarfs of different widths and inclinations. Skiving machines commonly comprise a knife, a feed roll and a presserfoot and the angle ofv the scarf has been varied in different ways, for example, by

providing interchangeable presser-feet of different contours or by adjusting the presser-foot into different angular positions. With a machine having interchangeable presser-feet it is possible to change with precision from one type of scarf to another, but the change causes delay, and the provision of a plurality of presser-feet involves considerable expense. in a machinein which the presser-foot is angularly adjustable,.it is difficult to change with rapidity and precision from one type of scarf to another. If, for, example, the presser-foot is set to produce a three-eighths inch scarf and it is desired to change to a three-quarters inch scarf, it is necessary to proceed. by the method of trial and error to adjust the presser-foot; and here again time is wasted.

By the present invention a plurality of stop surfaces are desired type of scar any one of which may be rendered operative to determine the po sition in which the presserfoot shall be held. The illustrative machine is provided machine for skiving the edges of pieces of.

On the other hand,

rovided, one for each with a rotary disk knife, a feed roll which is yieldable bodily, and angularly, and a presser-foot which "is adjustable about a pivot to determine the width and inclination of the scarf which shall be produced. Cooperating with r the presser-foot in such manner that any one of them 'may be rendered operative are a plurality of stops, each stop corresponding to a particular poe. sition 'of the. foot and consequently to a scarf of a certain inclination. With such a construction the operator 'may change rapidly and accurately'from a scarf of "one inclination to that of another merely by rendering one stop inoperative and another one operative. i

"This and otherufeatures of the inven-. W

tion, including certain details of constri1ction and combinations of parts, .will'be described as embodied in an illustrative machine and claims. Referring now to the accompanying draw ings; a

Figure l is a perspective ofa portion' of a machine, in which the present invention is embodied; Y 7 l s Fig. 2 is a perspective of the presserfoot and its support;

Fig. 3 is a detail partly in section and partly in elevation of a portion of the foot and one of the abutments; Y I

gig. 4 is an elevation of a modified for an m Y a r Fig. 5 is a plan of the stop members of the modified form.

Referring first to Figures 1 to inclu sive, the frame 7 of the machine is provided with a substantially flattop through a slot in which the upper portion of" a The roll. is normally pointed out in the; appended and the angle of the scarf produced isdee m nal bathe ese etros t 'w i the presser-foot 13 is adjusted, the roll, by reason of its yielding mounting, accommodating its position to that of the presserfoot. Any suitable mechanisms may be pro vided for rotating the knife and roll and for mounting the roll so that it may yield away from the knife to provide for different thicknesses of work and angularly to provide for scarfs of different widths and inclinations, such, for example, as those shown in the patents to Harmon, No. 1,161,860 and Hirth, No. 854,500. It has been thought not necessary to illustrate these mechanisms since in general they are old and well-known, it being common practice to provide arot'ary knife, a feed roll yieldablebodily and angularly and an adjustable presser-foot the position of which determines the'inclination of the scarf.

The presser-foot 13 is pivoted at 15 to a finger 17 formed at the outer end of a bracket 117, said bracket being adjustably fasten'edto the table of the machine by a cap-screw 19 whichypasses through a slot in the bracket and is threaded into the table. A guide rib 217 formed on the under side of the bracket fits in a guideway (not shown) in th'etable to ensure that'adjustmentof the bracket. shall take place in a direction transverse to the line of feed movement ofthe work; Fastened' to the body portion of the bracket 117 parallel to and spaced from the finger 17 is a second fingerQl, the tail 113 ofthe 'presser 'foot 13 being adapted to swing vertically in the space thus provided. A leaf-spring 23, fastened at one end to the bracket, bearsdownwardly with its free end against the top of a pin 25 carried by the tail of th e presse'r-foot 13 and tends at all times to swing'thel'tail '113 downwardly and thereby to swing the presser-foot proper 13.11pwardly'about the pivot 15. In order to determine the positionin which the presser-foot shall be held by the spring, a plurality of adjust'abl'e stops in the form of thumb-screws 27 are provided which are threaded through the tail of'the presserfoot. Adapted to cooperate selectively with the lower ends of the stop-screws are a plurality of abutments in the form of pins. Eachabutment (see Fig. 3) has a head 31 adapted to slide through a hole in the finger 21. said head being car ried at one end of a slender stem 33 which slides through a hole in the vertical plate of an angular bracket 35, the horizontal plate of which is fastened by screws37 to the stationary finger 2'1. Surrounding the stem 33 of each abutment and located between the head 31 and the vertical plate of the angular bracket 35fis a coiled spring 37 which tends at all times to urge the head 31 into position beneath the lower end of the corresponding stop-screw 113. In order to permit the abutment to be held in operative or inoperative position as'may be desired, each stem 33 has fast to its outer end a knurled head 39 having integral with it a slender finger &1 which may be caused either to contact with the vertical plate of the angular bracket 35 or to enter a hole 43 in said plate as may be desired. As long as the finger contacts with the plate, the abutment remains in inoperative position. Then the finger is moved into register with the hole provided for it, the spring 37, moves the abutment into operative position to engage the lower end of its corresponding stopscrew 27 and thereby to determine the angular position in which the leaf-spring 23 shall hold the presser-foot.

In the illustrative machine four stops 27 are provided. Assuming for convenience of description that the first stop (the right hand one as viewed in Fig. 1) has been adjusted to produce a scarf one inch in width and the succeeding three to produce scarfs of, three-quarter, one-half and one-quarter inches respectively, it will be seen that the operator may change with rapidity and precision from any one width ofscarfto any other by moving whateverv abutment is: in operative position into inoperative position and moving the desired abutment into operative position. In doing this it may be necessary to press down the operative portion of the presser-foot 13 so as to raise temporarily the tail of the presser-foot against the action of the leaf-spring 2-3. As illustrated the third abutment (counting from the right in Fig. 1) is operative, and a scarf one-half an inch in width would be produced on the work. If now it is desiredito produce a scarf one inch in width, the first abutment is rendered operative and the third one withdrawn to inoperative position.

Referring to Figures t and 5, wherein a modified constructionis shown, theknife ll and 150119 are exactly the same as in Fig. 1. The presser-foot is pivoted at to a bracket 57 and has threaded through its tail a screw 59 the lower end of which is held in contactwith any selected oneof four stops, presently to be described, by a leaf-spring 61 the lower end of which is fastened by a screw 63to. the stationary bracket 57 and the free upper end of which bears against the tail of'the p resser-foot. Located on the bracket is a disk-shaped carrier 65, said carrier being rotatably mounted on the upper smooth portion of a H screw 67 the lower reduced portion ofwhich is threaded into the bracket. Pivoted onthe: carrier are a plurality of stops, four being shown in the illustrative constructionQ Each stop 69 is pivoted at 71 to the carrier and is urged at all times to swing out wardlyf about its. pivot by a coiled spring.

73 which is located in a socket in the stop a and bears at one end against the bottom. of the socket and'atthe other end against the carrier 65. A screw 75 passes through a bore in each stop and through the coils of .stop 69 is a V-shaped groove 77 the depth of which increases from its narrow to its wide end, as shown best in Fig. 4; and with the bottom of one of these grooves the lower end of the screw 59 in the tail of the resser-foot is designed to contact during a skiving operation. The locality on the bottom of any groove 7 7 which will be engaged by the end of the screw 59 will depend upon the angular position into which the particular stop, in which the groove is formed, has been adjusted by turning the proper adjusting screw 75. In the figures three of the stops occupy the same angular position with respect to the carrier but in practice all four will usually be adjusted "into different angular positions so as to be effective to hold the presser-foot in four different positions. In the operation of the machine, when it is desired to change from a scarf of one inclination to one of a different inclination, all that is necessary is to rotate the carrier to bring the desired stop into position beneath the screw 59, the sides of the groove 77 being inclined upwardly and outwardly so that the rounded lower end of the screw 59 will ride out of one groove and into the next one when the carrier is rotated.

In the form shown in Figs. 1 to 3, the edge gage 81 has a stem which extends into a socket in the finger 21 and is adjustably held in position by a set-screw 83. In the form shown in Figs. 4 and 5, the edge gage S5 is shown in section and may be adjustably mounted in any suitable manner.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. A machine of the class described having in combination, a knife, a feed roll, an adjustable presser-foot adapted to hold the work against the roll and by its position to determine the character of the scarf produced, and means including a plurality of stop surfaces each corresponding to a scarf of predetermined character for determining the position which the foot shall occupy.

2. A machine of the class described having, in combination, a knife, a feed roll, an adjustable presser-foot adapted to hold the work against the roll and by its position to determine the character of the scarf produced, a spring tending at all times to urge the foot toward one limit of its adjustment and means acting in opposition to the spring and including a plurality of stop surfaces each corresponding to a scarf of a predetermined character for determining the'position in which the foot shall be held by the spring.

i 3. A machine of the class described having, in combination, a knife, a feed roll, an adjustable presser-foot adapted to hold the work against the roll and by its position to determine the length and inclination of the scarf produced, and a series of stops for the foot each stop corresponding to a se lected position of the foot, and means whereby a selected stop may be rendered operative.

4. A machine of the class described having, in combination, a knife, a feed roll, a pivoted presser-foot adapted to hold the work against the roll and by its position to determine the length and inclination of the scarf produced, and a series of stops for the foot each stop corresponding to a selected position of the foot, and means whereby a selected stop may be rendered operative.

5. A machine of the class described having, in combination, a knife, a feed roll, an adjustable presser-foot adapted to hold the work against the roll and by its position to determine the length and inclination of the scarf produced, and a series of stops for the foot each stop corresponding to a selected position of the foot, means whereby the stops may be adjusted to vary the selected positions as desired, and means whereby a selected stop may be rendered operative.

6. A machine of the class described having, in combination, a knife, a feed roll, an adjustable presser-foot, a stationary member to which the foot is pivoted, means tending at all times to urge the foot. about its pivot toward one limit of its adjustment, and a plurality of stops any selected one of which may be moved into position to determine the position in which the foot shall be held.

7. A machine of the class described having, in combination, a knife, a feed roll, an adjustable presser-foot adapted to hold the work against the roll and by its position determine the character of the scarf which will be produced, a spring tending at all times to move the foot toward one limit of its operative to determine the position in which.

the foot shall be held by the spring.

9. A machine of the class described hav ing in combination, a rotary disk'knife a cylindrical feed roll an angularly adjustable resser-foot adapted to hold the Work against the roll and by its position to de- 5 termine the character of the scarf produced,

a spring tending at all times to move the foot toward one limit of its adjustlnent and a plurality of stops any one of which may be rendered operative to determine the position in which the footshall be held by the 10 spring. 7 I

In testimony whe 'eof I have signed my name to this specification.

FRANK W. OHRISTY. I 

